Bunghole cover

ABSTRACT

Embodiments of a bunghole cover are disclosed. The bunghole cover may have a main body with a lower portion, and the lower portion may be configured to engage a bunghole of a storage drum. The bunghole cover may also have a sealing portion configured to substantially conform around one or more tubes inserted within the bunghole The bunghole cover may also have at least one connection mechanism configured to connect a first portion of the main body to a second portion of the main body.

BACKGROUND

1. Technical Field

The subject matter described herein relates to storage drums, and more specifically to covers for the openings of chemical storage drums.

2. Description of the Related Art

Chemical feed systems are often used to extract chemicals from storage drums. Chemical feed systems may include a section of suction tubing, a chemical pump, and a section of discharge tubing. The suction tubing may be placed in the opening or bunghole of a storage drum in order for the chemical pump to draw the chemical out, and may include a check or foot valve to prevent backflow and/or a screen or filter on the bottom of the suction tubing in the drum. The diameter of the suction tubing is smaller than the diameter of the bunghole, thereby leaving at least a portion of the bunghole uncovered and allowing the suction tubing to move within the bunghole.

If the bunghole is not at least partially covered, the contents of a storage drum may be exposed to the surrounding atmosphere or environment. For example, an uncovered bunghole increases the risk of splashing of the chemical (such as when the drum is moved or accidentally impacted). An uncovered bunghole also increases the possibility of chemical off-gassing which in turn may cause environmental contamination, odors, and in some cases an unpleasant or even dangerous workplace. Off-gassing may also reduce the shelf-life of a chemical stored in the storage drum if the product is volatile. An uncovered bunghole also increases the risk of contamination of the stored chemical itself because of the possibility that dirt, dust, other chemicals, vapors, etc. may enter the drum through the uncovered bunghole.

Previous attempts to minimize these effects while still allowing a chemical feed system to be used include bunghole closures that secure the suction tubing and/or seal the bunghole. These bunghole closures, however, usually require the bunghole closure to be installed at the same time as the chemical feed system is installed, and cannot be installed once the suction tubing is already in place. If the suction tubing is already in place and the bunghole closure is to be installed, the suction tubing must first be removed, which may present a chemical hazard to the person removing the suction tubing or the surrounding surfaces.

Also, some of these previous bunghole closures have threads or other features that are specific to one type of storage drum, and are thus not adaptable. Some only allow for a single section of suction tubing to be used to withdraw the stored chemical. Other bunghole closures have a separate portion of suction tubing used within the drum (i.e. one portion of suction tubing in the drum feeds into the bunghole closure, which feeds into a second portion of suction tubing, which feeds into the chemical pump) which increases the possibility of leaks, cracks, or other problems with the tubing sections.

The information included in this Background section of the specification, including any references cited herein and any description or discussion thereof, is included for technical reference purposes only and is not to be regarded subject matter by which the scope of the invention as claimed is to be bound.

SUMMARY

The various embodiments of a bunghole cover disclosed herein allow chemical storage drum bungs to be at least partially covered so as to reduce splashing, reduce off-gassing, increase the shelf life of the stored chemical, help prevent contamination, and so forth. The embodiments disclosed may be installed at the same time as a chemical feed system is installed or may also be placed on or in the bunghole after the chemical feed system is already in place. Furthermore, the flexibility of the disclosed embodiments allows for multiple lines of suction tubing to be used, and also allows a single bunghole cover to be used with several different types of bungholes.

A first embodiment of a bunghole cover may include a vinyl main body with a skirt-like shape, an elastic cinch, a releasable closure strap at the top of the main body, and releasable strips along the sides and a portion of the bottom of the main body. A second embodiment of a bunghole cover may include two half-circle, cylindrical halves that taper from the top to the bottom. A third embodiment of a bunghole cover may include a disk-shaped injection-molded plastic main body with foam inserts and a flange extending downward to attach to the top of the bunghole. A fourth embodiment of a bunghole cover may include a sheet of nitrile with one or more release tabs. The sheet of nitrile may have adhesive along the borders of the sheet. In some instances, one or more of the embodiments may be used together. For example, the first and second embodiments may be used together to cover a bunghole. Or, the fourth embodiment may be used with any of the first, second, or third embodiments. Also, additional embodiments similar to the first, second, third, and fourth disclosed embodiments of a bunghole cover may be used.

This Summary is provided to introduce a selection of concepts in a simplified form that are further described below in the Detailed Description. This Summary is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used to limit the scope of the claimed subject matter. Other features, details, utilities, and advantages of the present invention will be apparent from the following more particular written description of various embodiments of the invention as further illustrated in the accompanying drawings and defined in the appended claims.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1A depicts a drum with two bungholes, a pump, and tubing coming out of one of the bungholes and into the pump.

FIG. 1B is a close-up of the bunghole and tubing of FIG. 1A.

FIG. 2A is an isometric view of one embodiment of a bunghole cover, with the bunghole cover in a closed position.

FIG. 2B is a plan view of the bunghole cover of FIG. 2A, with the bunghole cover open and laid flat.

FIG. 2C is an isometric view of the bunghole cover of FIGS. 2A and 2B placed on the bunghole of a drum.

FIG. 3A is an isometric view of a second embodiment of a bunghole cover.

FIG. 3B is a top plan view of the bunghole cover of FIG. 3A.

FIG. 3C is a cross-section view of the bunghole cover of FIGS. 3A and 3B viewed along line 3C-3C of FIG. 3B.

FIG. 3D is an isometric view of the bunghole cover of FIGS. 3A, 3B, and 3C placed in the bunghole of a drum.

FIG. 4A is an isometric view of a third embodiment of a bunghole cover.

FIG. 4B is an isometric view of the bunghole cover of FIG. 4A in an open position.

FIG. 4C is a top plan view of the bunghole cover of FIG. 4A.

FIG. 4D is a cross-section view of the bunghole cover of FIGS. 4A through 4C viewed along line 4D-4D of FIG. 4C.

FIG. 4E is an isometric view of the bunghole cover of FIGS. 4A, through 4D, placed on the bunghole of a drum.

FIG. 5A is a bottom plan view of a fourth embodiment of a bunghole cover.

FIG. 5 b is an isometric view of the bunghole cover of FIG. 5A placed on the bunghole of a drum.

DETAILED DESCRIPTION

FIG. 1A shows a chemical feed system 100 that includes a storage drum 150 with two bungholes 152, 154, a portion of suction tubing 156, a chemical pump 158, and a portion of discharge tubing 160. The storage drum 150 may be made of polyethylene, some other type of plastic, metal, or any type of material suitable for storage of a chemical. Note also that the drum 150 may be used to store materials other than chemicals, such as water. The storage drum 150 may be any size, such as a 5-gallon, 15-gallon, 30-gallon, or 55-gallon drum. In still other embodiments, a larger (e.g., 250-375 gallon) chemical tote may be used. The suction 156 and discharge 160 tubing may also be made of polyethylene or any other type of chemically-resistant material. The suction tubing 156 may include a check valve or a foot valve connected at a distal end, and may also include a screen or filter (not shown in FIG. 1A). The suction tubing 156 may extend down to the bottom of the drum 150 so as to enable the pump 158 to draw all of the stored chemical out of the drum 150. The chemical pump 158 may be manual or electric, and may include a meter, an adjustable pump speed, and so forth. The chemical pump 158 may be placed on a nearby table or other supporting structure 170, as shown in FIG. 1.

FIG. 1B is a close-up view of the bunghole 152 and tubing 156 shown in FIG. 1A. The bungholes 152, 154 are defined by a circumferential lip or rim 162 that extends above the top surface of the drum 150. The rim 162 may be threaded to receive threaded caps that seal the bungholes 152, 156 during storage or transportation. In some embodiments, the outer surface of the bunghole rim 162 may be threaded (as shown in FIG. 1A), while in other embodiments the inner surface of the bunghole rim 162 may be threaded. In other embodiments, the inner surface of the bunghole rim 162 may be threaded, and the outer surface of the bunghole rim may have a single thread-type protrusion. Because the bunghole 152 of FIG. 1B is not covered, splashing, off-gassing, and so forth may occur.

FIG. 2A is an isometric view of a first embodiment of a bunghole cover 210. The bunghole cover 210 shown in FIG. 2A includes a vinyl body 212, an elastic cinch 214, a hook and loop (e.g. Velcro™) closure strap at the top 216, and opposing hook and loop strips 218 on the sides and on a portion of the bottom. It also includes a hook and loop pull tab 220 that protrudes from the bottom of the bunghole cover 210. The body 212 of the bung cover 210 may have a skirt-like shape; specifically, the body 212 may have an arc-shaped top 222 and bottom 224, with the bottom 224 being wider than the top 222, and straight sides. FIG. 2B is a plan view of the bunghole cover 210 of FIG. 1 laid flat, and illustrates the skirt-like shape, as just described. The bunghole cover 210 of FIGS. 2A and 2B may also have an elastic cinch 214. The cinch 214 may in some embodiments be formed by attaching an elastic strap to the bottom of the body 212, such as by sewing. The hook and loop closure strap 216 at the top of the bunghole cover 210 may be attached to the back side of the bunghole cover 210 (again, for example, by sewing), and may have loops on one side and hooks on the other so that when wrapped around, it attaches to itself. The hook and loop closure strap 216 may be provided in several different colors so as to allow a user to color-code chemical storage bins. The bunghole cover 210 may also have various configurations of hook and loop straps 218. As shown in FIGS. 2A and 2B, some embodiments of a bunghole cover 210 may include a portion of hooks 218 on the right, rear side of the body, and a portion of loops 218 on the left, front side of the body 212 or vice versa. The hooks 218 and loops 218 may be placed along the left and right sides of the body 212, and may also extend along the bottom of the body 212 for further attachment.

FIG. 2C shows the first embodiment of a bunghole cover 210 placed on the bunghole 252 of a chemical storage drum 250. In FIG. 2C, the body 212 of the bunghole cover 210 has been wrapped around the rim 262 of the bunghole 252, with tubing 256 extending from it and with the cinch 214 at the bottom of the bunghole cover 210 engaging the sidewalls of the bunghole 252. The hooks 218 on the right rear side engage the loops 218 on the left front side of the body and the hook and loop closure strap 216 at the top of the cover 210 wraps around and engages itself. Note that the top 222 of the bunghole cover 210 (along with the closure strap 216) provide some flexibility for one, two, or more sections of suction tubing 256 to be used. Also, note that the bunghole cover 210, while helping to prevent most materials from improperly entering or exiting the drum 250, does allow for slight air permeation, which allows for the displacement of the liquid volume as the chemical is withdrawn from the drum 250.

Many variations on the specific design of the bunghole cover 210 shown in FIGS. 2A through 2C are possible. For example, although the body 212 of the bunghole cover 210 of FIG. 2A may be made of vinyl, the body 212 may also be made of rubber or any other chemically-resistant material appropriate for the application. Generally, the type of material may depend on the type of chemical stored in a drum 250 that needs to be covered. For example, if a chemical is known to interact with vinyl, then a different type of material may be used for constructing the body 212 of the bunghole cover 210. In some embodiments, the body 212 may be made of a stretchable material to provide further flexibility. Also, any type of fastener or fastening mechanism may be used in place of the hook and loop strips 218 and/or hook and loop closure strap 216 of FIGS. 2A-2C, for example, snaps, buttons, a zipper, adhesive, one or more clip(s), a tie string, and so forth. In some embodiments, the top portion 222 of the bunghole cover 210 may also include a cinch or other tightening closure mechanism. In some embodiments the bottom cinch 214 and/or top cinch can be a pull string, or some other type of elastic mechanism enclosed within a hem or seam along the bottom edge 224. The cinch 214 may also be formed in any of several different ways. For example, the cinch 214 may be formed by folding the bottom portion 224 of the body 212 over on itself while inserting a piece of elastic material, and sewing the body 212 to the elastic and to itself.

Also, the placement of the hook and loop material 218 or other fastening mechanism may be different than that shown in FIGS. 2A through 2C. For example, there may be no hook and loop material 218 on the bottom of the cover 210, or there may be no hook and loop material 218 along the sides of the cover 210. In other embodiments, all of the hook and loop material 218 may extend from the body 212 of the bunghole cover 210 (just as the tab 220 at the lower right side in FIG. 2B does), or one or more strips of hook and loop material 218 may be placed more towards the center of the body 212 rather than on the sides and bottom 224. The hook and loop material 218 (or other fastening mechanism, as discussed above) may be joined to the body 212 of the bunghole cover 210 in any of various ways, such as by sewing, adhesive, bonding, and so forth. The body 212 of the bunghole cover 210 may also be different than that shown in FIG. 2B. For example, the body 212 may be a generally rectangular shape. Also, the bunghole cover 210 shown in FIGS. 2A through 2C may generally be adaptable to any of a 5-, 15-, 30-, or 55-gallon drum 250. A larger bunghole cover 210, similarly constructed, may be used for a larger chemical tote.

FIGS. 3A through 3D show a second embodiment of a bunghole cover 310. Specifically, FIG. 3A shows an isometric perspective view of a second embodiment of a bunghole cover 310 that may be placed within a bunghole 352 of a storage drum 350. The bunghole cover 310 shown in FIG. 3A may be made of foam 312, which may be cut from a larger block of foam or may be injection molded foam. The foam 312 may be coated with a vinyl or other coating 318 to resist interaction with one or more chemical products, as well as to resist deterioration of the foam 312. The foam 312 may be coated on all sides with the chemically-resistive coating 318 either during formation (e.g., as during the injection molding process) or after the foam 312 is formed. The coating 318 may allow the foam 312 to still be flexible so as to allow tubing 356 to be placed between the two halves 314, 316 of the bunghole cover.

FIG. 3B shows a top plan view of the second embodiment of a bunghole cover 310. The cover 310 may include two halves 314, 316 that are similarly shaped. The two halves 314, 316 together may form a frustum. FIG. 3C shows a cross section view of the bunghole cover 310 shown in FIG. 3B along line 3C-3C. As can be seen in FIG. 3C, the sides of the bunghole cover 310 taper down so that the top 320 of the bunghole cover 310 is larger than the bottom 322, thus generally forming a cork-type or inverted frustum shape, split in half In one embodiment, the top 320 of the bunghole cover 310 may be approximately three inches in diameter, which is slightly wider than the bunghole 352 for 5-, 15-, 30-, and 55-gallon storage drums, and the body of the cover 310 may taper down to be approximately two inches in diameter at the bottom 322, which is slightly smaller than the bunghole 352 for 5-, 15-, 30-, and 55-gallon storage drums. Accordingly, the bunghole cover 310 shown in FIGS. 3A through 3C may be placed within the bunghole 352 of a drum 350 because the bottom 322 is smaller in diameter than the bung opening 352, but may not fall through the bunghole 352 because the top 320 is larger in diameter than then bung opening 352.

FIG. 3D shows the second embodiment of a bunghole cover 310 placed in the bunghole 352 of a storage drum 350, with a portion of suction tubing 356 protruding from the bunghole 352 and bunghole cover 310. As can be seen in FIG. 3D, the sides of the bunghole cover 310 engage the sides of the bunghole 352 near the top 320 of the bunghole cover 310 at the point where the diameter of the sides of the bunghole cover 310 approximately equal the diameter of the bunghole 352. As can also be seen in FIG. 3D, one, two, or more sections of tubing 356 may be used with the second embodiment of a bunghole cover 310.

The second embodiment of a bunghole cover 310 shown in FIGS. 3A through 3D may be used alone or in combination with the first embodiment of a bunghole cover 210 shown in FIGS. 2A through 2C. Specifically, the second embodiment of a bunghole cover 310 may be placed in the bunghole 352 of a storage drum 350, while the first embodiment of a bunghole cover 210 may be wrapped around the side-walls of the bunghole 352. Combining the first 210 and second 310 embodiments together may provide greater reduction in off-gassing, more security to keep the suction tubing 356 in place, additional barriers for protecting against contamination, and so forth. Nonetheless, either of the first 210 and/or second 310 embodiments of a bunghole cover may be used separately.

If the first 210 and second 310 embodiments are used together, a strap (not shown) may be attached between the first embodiment 210 and the second embodiment 310 in order to keep them together. For example, small holes may be made in the body 212 of the first embodiment 210, and in the first and second halves 314, 316 of the second embodiment 310, and a string or strap may be placed through the holes and tied.

As with the first embodiment 210 described above, the second embodiment (alone or in combination with the first embodiment 210) of a bunghole cover may allow for slight air permeation into the drum 350 in order to allow for displacement of liquid volume as a stored chemical is withdrawn from the storage drum 350. It also allows for one, two, or more sections of suction tubing 356 to be used.

As with the first embodiment 210, many variations to the second embodiment 310 are possible. For example, the shape of the second embodiment 310 may vary, and may be, for example, in the shape of a frustum, a tapered hexagonal section, a tapered square section, etc. Additionally, the second embodiment of a bunghole cover 310 may not have a chemically-resistive coating in order to make the foam 312 less costly. In other embodiments the foam 312 may only be coated on the bottom. In still other embodiments, a material other than foam may be used. For example, capsules shaped similarly to the foam 312 shown in FIG. 3A may be filled with gel, water, sand, air, cotton, rubber, beads, or another material and placed within the bunghole 352 of a drum 350. A flexible and compressible rubber or elastomer material may be used. Also, in some embodiments, a strap or other type of connection may be used to join the two halves 314, 316 of the bunghole cover 310 to help prevent a user from dropping the two halves 314, 316 in the storage drum 350 during installation. Also, the dimensions of the bunghole cover 310 may vary from the dimensions described above. For example, the bottom 322 of the cover 310 may be only one inch in diameter, and the top 320 of the cover 310 may be four inches in diameter. Furthermore, when the second embodiment of a bunghole cover 310 is used for larger chemical totes, the dimensions of the bunghole cover may be adapted to the bungholes or openings of the chemical totes.

FIGS. 4A through 4E show a third embodiment of a bunghole cover 410. Specifically, FIG. 4A shows an isometric view of the third embodiment of a bunghole cover 410 in a closed position. The third embodiment may take the form of a plastic clamp 412 housing a foam body. The main body 414 of the bunghole cover 410 may be an exterior shell made of non-adherent plastic and may be formed, for example, by an injection molding technique. The main body 414 may be generally circular in shape, and may be comprised of two halves 418, 420.

FIG. 4B shows an isometric view of the third embodiment of a bunghole cover 410 in an open position. As shown in FIG. 4B, each of the two halves 418, 420 may have opposing tangential flange structures 416, 426 defining apertures. Each half 418, 420 may have a single flange structure 416 on one side and a double flange structure 426 on the opposite side. The flanges of the double flange structure 426 are parallel and spaced apart and the single flange structure 416 is positioned on the side of each half 418, 420 such that it may fit between the flanges of the double flange structure 426. In this manner, the two halves 418, 420 may be identical, which may facilitate manufacturing. The two halves 418, 420 may be joined together by interlocking the single flange structure 416 of each half 418, 420 with the double flange structure of each half 418, 420. When the single flange structure 416 interlocks with the double flange structure 426, the apertures in the flange structures 416, 426 align. The two halves 418, 420 of the bunghole cover 410 may be joined by a pin 424 placed through the aperture in the overlapping flange structures 416, 426 on one side of the main body 414. The pin 424 (which may be plastic) may form a hinge-type structure as shown in FIG. 4B. The tangential flange structures 416, 426 on the other side of the two halves 418, 420 may similarly be interleaved and a locking mechanism (not shown) may be placed through the apertures in the flange structures 416, 426 to lock the cover 410 on the bunghole 452 of a chemical drum 450. Exemplary lock mechanisms may include plastic zip ties, wire, pad locks, spring clips, or any other mechanism capable of insertion through the apertures in the flange structures 416, 426.

As can be further seen in FIG. 4B, a material such as foam 430 may fill the cavity of the main body 414 or exterior shell of the third embodiment of a bunghole cover 410. The foam 430 may be similar to the foam 312 described above in connection with FIGS. 3A through 3C (the second embodiment of a bunghole cover 310) in that it may have a chemically-resistant coating 346. Also, as discussed above, capsules filled with water or sand or other material, rubber filler, or any other material may be used to fill the cavity of the exterior shell 414. In this embodiment, the foam halves 430 may form a disk-shape as opposed to an inverted frustum as in the second embodiment. As shown in FIG. 4B, the foam 430 or other material may extend throughout the cavity, but in other embodiments it may not. The foam 430 (or other material) inserts may be replaceable.

FIG. 4B also shows that the third embodiment of a bunghole cover 410 may include a flange 432 on the bottom that clamps around the raised lip or spout of the bunghole 152 to fasten the cover 410 in place around the bunghole 452. Although many dimensions are possible, the flange 432 may extend in some embodiments approximately a half an inch downward from the outside edge of the main body exterior shell 414, and may have a lip 434 that extends approximately a quarter of an inch towards the center of the cover 410 to fit underneath the threading on the spout of the bunghole 152, which is a common configuration of many chemical drums 150.

FIG. 4C shows a top plan view of the third embodiment of a bunghole cover 410, and FIG. 4D shows a cross-section view of the bunghole cover 410 of 4C viewed along line 4D-4D. FIG. 4E shows the bunghole cover 410 of FIGS. 4A-4D placed around the bunghole 452 of a chemical storage drum 450 with a section of suction tubing 456 exiting out of the drum 450 through the bunghole cover 452. The third embodiment of the bunghole cover 410 as shown in FIGS. 4A through 4E may be easy to install and is also durable, particularly if the foam inserts 430 are replaceable. The third embodiment 410 may be useful in high traffic areas. As with the first 210 and second 310 embodiments described above, the third embodiment of the bunghole cover 410 may allow for slight air permeation through the small gap between the halves of foam 430 around the suction tubing 456 into the drum 450 in order to allow for displacement of liquid volume as a stored chemical is withdrawn from the storage drum 450. It also allows for one, two, or more sections of suction tubing 456 to be used.

The flange 432 on the bottom of the cover 410 may have many different dimensions than that shown in FIGS. 4B and 4D and described above. For example, the flange 432 may extend one inch downward. Also, the flange may not be flush with the edges of the main body 414. In some embodiments, the flange 432 and lip 434 may be formed with the main body 414 in, for example, an injection molding process, or the flange 432 and lip 434 may be joined to the main body 414 later. Additionally, the flange 432 may be used without a lip 434. As also explained above, the foam 430 within the main body shell 414, may be a different material, or a capsule may be used in place as well. In some embodiments, the foam 430 and the main body shell 414 may be shaped so that the foam 430 (or other) inserts in the third embodiment of a bunghole cover 410 are similar or identical to the foam 312 (or other material) used in the second embodiment of a bunghole cover 310 as shown in FIGS. 3A through 3D. Also, a different connection mechanism 424 may be used rather than the pin described above.

FIGS. 5A and 5B show a fourth embodiment of a bunghole cover 510. Specifically, FIG. 5A shows the bottom or under side of the fourth embodiment 510 laid flat. The cover 510 may be made of a form of nitrile 512 (such as nitrile butadiene rubber or NBR) and may be approximately five to seven mils thick. The length and width of the cover 510 may vary depending on the size of the bunghole, but in general may be approximately five inches by twelve inches for bungholes on 5-, 15-, 30-, and 55-gallon drums. A sufficient length may allow the nitrile sheet 510 to wrap around and adhere to itself to enhance the seal. An adhesive 514 may coat the exterior border on the bottom or under side of the nitrile sheet 510. The adhesive 514 may be a synthetic elastomer or other type of adhesive 514 that sticks to nitrile 512 and polyethylene drums. For example, the adhesive 514 may be 3M™ Hi-Strength 90 Adhesive, 3M™ Scotch-Weld™ Hi-Strength Cylinder Spray Adhesive, 3M™ Scotch-Weld™ High Performance Industrial Plastic Adhesive, and so forth.

Strips of plastic release (not shown) may be placed over the adhesive 514 on the nitrile 512 for storage and shipping. Also, one or more tabs may be placed on the sides of the nitrile sheet, which may or may not also have adhesive. The tabs 518 may facilitate removal of the fourth embodiment of a bunghole cover 510, which may be used as a one-time, quick-to-apply, quick-to-remove bunghole cover 510.

FIG. 5B shows the bunghole cover 510 of FIG. 5A wrapped around the sidewall 562 of the bunghole 552 of a chemical storage drum 550. It also shows two sections of suction tubing 556 protruding from the bunghole 552 and bunghole cover 510.

As with the first 210, second 310, and third 410 embodiments described above, the fourth embodiment 510 of a bunghole cover may allow for slight air permeation into the drum 550 in order to allow for displacement of liquid volume as a stored chemical is withdrawn from the storage drum 550. It also allows for one, two, or any number of sections of suction tubing 556 to be used—two sections of suction tubing 556 are shown in FIG. 5B.

Many variations are also possible for the fourth embodiment of a bunghole cover 510. For example, the main body or sheet 510 may be made from a material other than nitrile, for example, vinyl, rubber, or any material that is resistant to chemical deterioration and chemical reactions, which may vary depending on the chemical stored. Also, many different types of adhesive 514 may be used. For example, a stronger adhesive 514 may be used for applications that need to last longer, whereas a weaker adhesive 514 may be used for more temporary applications.

Many of the embodiments 210, 310, 410, 510 of a bunghole cover disclosed above may provide the benefits of reducing the risk of chemical splashing and exposure, reducing chemical off-gassing (which in turn may reduce environmental contamination and reduce odors around the chemical storage drums), increasing the shelf-life of stored chemicals by reducing the release of product actives, reducing contamination of stored chemicals by helping prevent liquids, solids, and gasses from entering the storage drum and interacting with the stored chemical, preventing cross-contamination of chemicals, and/or improving indoor air quality. Also, the embodiments disclosed above may all be installed either at the same time a chemical feed system 100 is installed or they may be installed on a bunghole even after the chemical feed system 100 is already in place. Furthermore, many of the embodiments above may be easily removed from the storage drum 150 and, in some cases, may even be reused on other chemical storage drums 150.

A variety of embodiments and variations of structures and methods are disclosed herein. Where appropriate, common reference numbers and words were used for common structure and method features. However, unique reference numbers and words were sometimes used for similar or the same structure or method elements for descriptive purposes. As such, the use of common or different reference numbers or words for similar or the same structural or method elements is not intended to imply a similarity or difference beyond that described herein.

All directional and relative references (e.g., proximal, distal, upper, lower, upward, downward, left, center, right, side, lateral, front, middle, back, rear, top, bottom, above, below, vertical, horizontal, clockwise, and counterclockwise) are given by way of example to aid the reader's understanding of the particular embodiments described. They should not be read to be requirements or limitations, particularly as to the position, orientation, or use of the invention unless specifically set forth in the claims. Connection references (e.g., attached, coupled, connected, and joined, etc.) are to be construed broadly and may include intermediate members between a connection of elements and relative movement between elements unless otherwise indicated. As such, connection references do not necessarily infer that two elements are directly connected and in fixed relation to each other, unless specifically set forth in the claims. The exemplary drawings are for purposes of illustration only and the dimensions, positions, order and relative sizes reflected in the drawings attached hereto may vary.

The above specification, examples and data provide a complete description of the structure and use of exemplary embodiments of the invention as claimed below. Although various embodiments have been described above with a certain degree of particularity, or with reference to one or more individual embodiments, those skilled in the art could make numerous alterations to the disclosed embodiments without departing from the spirit or scope of the claims. Other embodiments are therefore contemplated. It is intended that all matter contained in the above description and shown in the accompanying drawings shall be interpreted as illustrative only of particular embodiments and not limiting. Changes in detail or structure may be made without departing from the basic elements of the invention as defined in the following claims. 

1. A bunghole cover comprising a main body with a lower portion, wherein the lower portion is configured to engage a bunghole of a storage drum; a sealing portion configured to substantially conform around one or more tubes inserted within the bunghole; and a first connection mechanism configured to connect a first portion of the main body to a second portion of the main body.
 2. The bunghole cover of claim 1, wherein the main body is a piece of flexible sheet material, the lower portion comprises an elastic cinch, and the first connection mechanism is a hook and loop material.
 3. The bunghole cover of claim 2, wherein the flexible sheet material is rubber-based.
 4. The bunghole cover of claim 2, wherein the flexible sheet material is vinyl.
 5. The bunghole cover of claim 2, further comprising a hook and loop closure strap attached to the sealing portion.
 6. The bunghole cover of claim 1, wherein the main body is a clamp; the lower portion comprises an annular flange extending downward from the lower portion and is configured to engage a lip of the bunghole; and the first connection mechanism is a pin that connects at least a first side flange of the first portion of the main body to a second side flange of the second portion of the main body.
 7. The bunghole cover of claim 6, wherein the clamp is injection molded plastic.
 8. The bunghole cover of claim 6 wherein the sealing portion further comprises a first foam insert and a second foam insert.
 9. The bunghole cover of claim 8, wherein the first and second foam inserts comprise a chemically-resistant coating.
 10. The bunghole cover of claim 8, wherein the first and second foam inserts are formed by injection molding.
 11. The bunghole cover of claim 6, wherein the annular flange further comprises a lip extending radially inward.
 12. The bunghole cover of claim 1, wherein the main body is a sheet of nitrile; the sealing portion is an upper portion of the main body; and the first connection mechanism is an adhesive.
 13. The bunghole cover of claim 12, wherein the adhesive is a synthetic polymer.
 14. The bunghole cover of claim 12 further comprising a pull-tab extending from an edge of the sheet.
 15. A bunghole cover, comprising a first and second foam insert, each with a top and a bottom; wherein the first foam insert is a half-circle frustum that tapers from the top to the bottom on a first side of the first foam insert; wherein the second foam insert is a half-circle frustum that tapers from the top to the bottom on a first side of the second foam insert; and wherein the first and second inserts are configured to jointly engage a bunghole of a storage drum near the tops of the first and second inserts and surround one or more tubes inserted through the bunghole.
 16. The bunghole cover of claim 15, wherein the first and second foam inserts comprise a chemically-resistant coating.
 17. The bunghole cover of claim 15, wherein the first and second foam inserts are injection-molded.
 18. A method of covering a bunghole, comprising engaging a sidewall of the bunghole with a lower portion of a bunghole cover; substantially sealing one or more tubes inserted within the bunghole with the bunghole cover; connecting a first portion of the bunghole cover to a second portion of the bunghole cover.
 19. The method of claim 18, wherein the bunghole cover comprises a flexible sheet material.
 20. The method of claim 18, wherein the bunghole cover comprises an injection molded plastic clamp. 